diff --git a/iOSPlot/Shared/PCLineChartView.m b/iOSPlot/Shared/PCLineChartView.m
index b8d57aa..40671e6 100644
--- a/iOSPlot/Shared/PCLineChartView.m
+++ b/iOSPlot/Shared/PCLineChartView.m
@@ -71,7 +71,7 @@ - (void)drawRect:(CGRect)rect {
 	CGContextSetRGBFillColor(ctx, 0.2f, 0.2f, 0.2f, 1.0f);
 
 	int n_div;
-	int power;
+	int power=0;
 	float scale_min, scale_max, div_height;
 	float top_margin = 35;
 	float bottom_margin = 25;